Canon PIXMA MG7150 - Manual (Page 14)

Character Entry
You can enter the characters when the keyboard is displayed on the printer. Follow the procedure below.
1. You can enter the characters when the keyboard is displayed on the printer's LCD.
Character entry is case sensitive.
: Tap to switch between "lower case letters" and "numbers and symbols."
: While letters of the alphabet appear, tap to switch between upper and lower case letters. While numbers
and symbols appear, tap to switch symbol types.
: Tap to insert a space.
: Tap to delete the character at the cursor. Use or to move the cursor to the target character.
2. Tap the character you want to enter.
3. Repeat 1 and 2 to enter the remaining characters.